A poly(urethane)-encapsulated benzo[2,3-d:6,7-d’]diimidazole organic down-converter for green hybrid LEDs

Wiles, A. A. et al. (2020) A poly(urethane)-encapsulated benzo[2,3-d:6,7-d’]diimidazole organic down-converter for green hybrid LEDs. Materials Chemistry Frontiers, 4(3), pp. 1006-1012. (doi: 10.1039/C9QM00771G)

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The development of organic down-converting materials continues to attract attention in hybrid LED technology by obviating the need for non-sustainable rare-earth elements. In this work, a benzodiimidazole-based system (TPA-BDI) has been employed as a down-converting layer in a hybrid organic–inorganic LED device. A commercially available poly(urethane)-based resin is used as the encapsulating material, providing a dilute layer of TPA-BDI that is deposited on top of the GaN-based LED. Crucially, the solution-state emissive performance is generally maintained when encapsulated at low concentrations within this resin. A maximum luminous efficacy of 87 lm W−1 was demonstrated using a 1.0 mg ml−1 concentration of TPA-BDI in the resin. The suitability of using organic down-converters to produce green light from hybrid devices was demonstrated by the excellent repeatability of the device characteristics across a series of encapsulated LEDs.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Skabara, Professor Peter and Cariello, Dr Michele and Cooke, Professor Graeme and Mohammed, Nabeel and Wiles, Dr Alan and Cameron, Dr Joseph and Findlay, Dr Neil
Authors: Wiles, A. A., Bruckbauer, J., Mohammed, N., Cariello, M., Cameron, J., Findlay, N. J., Taylor-Shaw, E., Wallis, D. J., Martin, R. W., Skabara, P., and Cooke, G.
College/School:College of Science and Engineering
College of Science and Engineering > School of Chemistry
Journal Name:Materials Chemistry Frontiers
Publisher:Royal Society of Chemistry
ISSN (Online):2052-1529
Published Online:06 February 2020
Copyright Holders:Copyright © 2020 The Royal Society of Chemistry and the Chinese Chemical Society
First Published:First published in Materials Chemistry Frontiers 4(3): 1006-1012
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
303776Light-controlled manufacturing of semiconductor structures: a platform for next generation processing of photonic devicesPeter SkabaraEngineering and Physical Sciences Research Council (EPSRC)EP/P02744X/2Chemistry